A mixture of American English and British English spellings doesn't bother me any more than British English spellings do.
![laugh laugh](/ubb/images/graemlins/default/laugh.gif)
I do tend to notice -- but I'm a grammar geek.
![clap clap](/ubb/images/graemlins/default/clap.gif)
If I tried to write a story in another language, trust me, the spelling would be the least of my worries.
![wink wink](/ubb/images/graemlins/default/wink.gif)